public class OuterClass {
    public int data1=1;
    public int data2=1;
    public static int data3=1;
    //静态内部类的实例
    static class InnerClass{
        public int data4=4;

        public void test01(){
            System.out.println("inner test01");
            System.out.println(data3);

        }
    }
}
